Stackable precast concrete stairwell unit



FIG. 1 is a perspective view of a stackable precast concrete stairwellunit showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is an end view thereof, the opposite end view being the same;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof; and,

FIG. 6 is a cross-section view taken on the line 6—6 of FIG. 2.

The ornamental design of a stackable precast concrete stairwell unit, asshown and described.